Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Puranjay Mohan | 723 | 84.07% | 1 | 25.00% |
Marco Felsch | 136 | 15.81% | 2 | 50.00% |
Uwe Kleine-König | 1 | 0.12% | 1 | 25.00% |
Total | 860 | 4 |
// SPDX-License-Identifier: GPL-2.0-only /* * Digital temperature sensor with integrated Non-volatile memory * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com> * * Driver for the Texas Instruments TMP117 Temperature Sensor * (7-bit I2C slave address (0x48 - 0x4B), changeable via ADD pins) * * Note: This driver assumes that the sensor has been calibrated beforehand. */ #include <linux/err.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/bitops.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/limits.h> #include <linux/property.h> #include <linux/iio/iio.h> #define TMP117_REG_TEMP 0x0 #define TMP117_REG_CFGR 0x1 #define TMP117_REG_HIGH_LIM 0x2 #define TMP117_REG_LOW_LIM 0x3 #define TMP117_REG_EEPROM_UL 0x4 #define TMP117_REG_EEPROM1 0x5 #define TMP117_REG_EEPROM2 0x6 #define TMP117_REG_TEMP_OFFSET 0x7 #define TMP117_REG_EEPROM3 0x8 #define TMP117_REG_DEVICE_ID 0xF #define TMP117_RESOLUTION_10UC 78125 #define MICRODEGREE_PER_10MILLIDEGREE 10000 #define TMP116_DEVICE_ID 0x1116 #define TMP117_DEVICE_ID 0x0117 struct tmp117_data { struct i2c_client *client; s16 calibbias; }; static int tmp117_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int *val, int *val2, long mask) { struct tmp117_data *data = iio_priv(indio_dev); s32 ret; switch (mask) { case IIO_CHAN_INFO_RAW: ret = i2c_smbus_read_word_swapped(data->client, TMP117_REG_TEMP); if (ret < 0) return ret; *val = sign_extend32(ret, 15); return IIO_VAL_INT; case IIO_CHAN_INFO_CALIBBIAS: ret = i2c_smbus_read_word_swapped(data->client, TMP117_REG_TEMP_OFFSET); if (ret < 0) return ret; *val = sign_extend32(ret, 15); return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: /* * Conversion from 10s of uC to mC * as IIO reports temperature in mC */ *val = TMP117_RESOLUTION_10UC / MICRODEGREE_PER_10MILLIDEGREE; *val2 = (TMP117_RESOLUTION_10UC % MICRODEGREE_PER_10MILLIDEGREE) * 100; return IIO_VAL_INT_PLUS_MICRO; default: return -EINVAL; } } static int tmp117_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *channel, int val, int val2, long mask) { struct tmp117_data *data = iio_priv(indio_dev); s16 off; switch (mask) { case IIO_CHAN_INFO_CALIBBIAS: off = clamp_t(int, val, S16_MIN, S16_MAX); if (off == data->calibbias) return 0; data->calibbias = off; return i2c_smbus_write_word_swapped(data->client, TMP117_REG_TEMP_OFFSET, off); default: return -EINVAL; } } static const struct iio_chan_spec tmp117_channels[] = { { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_SCALE), }, }; static const struct iio_chan_spec tmp116_channels[] = { { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), }, }; static const struct iio_info tmp117_info = { .read_raw = tmp117_read_raw, .write_raw = tmp117_write_raw, }; static int tmp117_identify(struct i2c_client *client) { const struct i2c_device_id *id; unsigned long match_data; int dev_id; dev_id = i2c_smbus_read_word_swapped(client, TMP117_REG_DEVICE_ID); if (dev_id < 0) return dev_id; switch (dev_id) { case TMP116_DEVICE_ID: case TMP117_DEVICE_ID: return dev_id; } dev_info(&client->dev, "Unknown device id (0x%x), use fallback compatible\n", dev_id); match_data = (uintptr_t)device_get_match_data(&client->dev); if (match_data) return match_data; id = i2c_client_get_device_id(client); if (id) return id->driver_data; dev_err(&client->dev, "Failed to identify unsupported device\n"); return -ENODEV; } static int tmp117_probe(struct i2c_client *client) { struct tmp117_data *data; struct iio_dev *indio_dev; int ret, dev_id; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) return -EOPNOTSUPP; ret = tmp117_identify(client); if (ret < 0) return ret; dev_id = ret; indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!indio_dev) return -ENOMEM; data = iio_priv(indio_dev); data->client = client; data->calibbias = 0; indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->info = &tmp117_info; switch (dev_id) { case TMP116_DEVICE_ID: indio_dev->channels = tmp116_channels; indio_dev->num_channels = ARRAY_SIZE(tmp116_channels); indio_dev->name = "tmp116"; break; case TMP117_DEVICE_ID: indio_dev->channels = tmp117_channels; indio_dev->num_channels = ARRAY_SIZE(tmp117_channels); indio_dev->name = "tmp117"; break; } return devm_iio_device_register(&client->dev, indio_dev); } static const struct of_device_id tmp117_of_match[] = { { .compatible = "ti,tmp116", .data = (void *)TMP116_DEVICE_ID }, { .compatible = "ti,tmp117", .data = (void *)TMP117_DEVICE_ID }, { } }; MODULE_DEVICE_TABLE(of, tmp117_of_match); static const struct i2c_device_id tmp117_id[] = { { "tmp116", TMP116_DEVICE_ID }, { "tmp117", TMP117_DEVICE_ID }, { } }; MODULE_DEVICE_TABLE(i2c, tmp117_id); static struct i2c_driver tmp117_driver = { .driver = { .name = "tmp117", .of_match_table = tmp117_of_match, }, .probe = tmp117_probe, .id_table = tmp117_id, }; module_i2c_driver(tmp117_driver); MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>"); MODULE_DESCRIPTION("TI TMP117 Temperature sensor driver"); MODULE_LICENSE("GPL");
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